Algalon was sent by the titans after Watcher Loken's death activated a planetary fail-safe protection, indicating possible distress on Azeroth. Algalon's task is to analyze any systemic corruption on the planet. If it's deemed beyond saving, the Titans will "re-originate" the planet to cleanse it of corruption, killing all currently living organisms in the process.
Reply code "Alpha" = "All is well" .
Reply code "Omega" = "Destruction of Azeroth".